Offset overshot tool



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OFFSET OVERSHOT TOOL Filed Sept.

IMM/W mw 6 Eli( Patented Dec. 10, 1929 PATENT; OFFICE GUSTAVE J. CORMIER, F SEMINOLE, OKLAHOMA.

OFFSET OVERSHOT TOOL Application med September 27, 1927. Serial No. 222,321.

In the drillin of wells it frequently occurs that tubing, ro s, or the like, are bro en and when so broken lean against the side of the casing where they are very diiiicult to enn gage with the ordinary fishing tool known as an overshot. That is, the fishing tool hangs in the center of the hole and thus cannot pass over the end of the rods or tubing which rest against the side of the casing.

An object of my invention is -to provide a fishing tool which can be oli'set to engage the tubing, rods, or the like, and move them to the center where they can be grasped by the shing tool.

13 Another object is to provide a lishing tool which is operated by the hydraulic pressure from the sludge pumps, or the drilling mud standing in the pipe.

@ther objects, advantages, and features of 3U invention may appear from the accompanying drawing, the subjoined detailed description, and the-appended claims.

1n the drawing: Fig. 1, is a longitudinal sectionalview of my iishing tool.

Fig. 2, is a longitudinal sectional View of the same in oset position.

Referring more particularly to the draw- HI' I 3@ lldy shing tool comprising a hook 1 which is screwed onto a slip casing 2 and a hinged joint 3 is threaded into the top ofthe slip casing 2. The usual slips 4 are positioned 1n the casing 2 and are urged downwardly into engaging position by a cup 5 resting on the top thereof, and a spring positioned between plates 7 8 and by the additional urge of the sludge pump pressure on the drilling mud, as will be further described.

A tube 9 rises above the joint 3 and is hinged to said joint by the pin 10, or any other suitable joint connection, and w1thin the tube 9 l provide the offset mechanism 11 which comprises a piston 12 to which is secured a post 13 formed with a wedge 14 on the bottom thereof. To the joint 3 is secured a fitting 15 to which a roller 16 is secured. A second roller 17 is secured to the tubular section 9 and the wedge 14 operates between the m rollers 16, 17. A guide 18 is provided for the post 13 and a spring 19 is positioned between the guide 18 and iston 12.

The drilling o an oil well by the rotary process requires that a constant fiow of mud and water shall be forced down through the drill pipe and upwardly in the casing to the surface. This mud and water is called drilling mud and serves to lubricate the bit, remove the particles cut by the bit, and also serves to sustain the walls of the hole before the casing is set in position. This drilling mud is necessarily forced into the hole under a very high pressure since it must be circulated to the bottom of the hole and again to the surface in order to accomplish the process above stated.

In operation the sludge pump pressure forces the piston 12 downwardly against the tension of the spring 19, thus moving the post 13 downwardly and carrying the wedge 111 between the rollers 16, 17 and thus moving the roller 16, joint 3, and the entire lower section of the tool to one side, as shown in Figure 2. Small bleed holes 20 are provided in the piston 12 and the mud passes through the 75 holes, and thence through the duct 21 through the joint 3, which last named duct opens to the space above the cup 5. The drilling mud pressure forces the cup 5 and slips 4 downwardly grasping thepipe or the rods which have been moved upwardly between the slips by the action of the hoolr 1, as will be evident to those skilled in the art.

Having described my invention, I claim:

1. An offset overshot tool comprising a wall hook, a slip casing rising from the hook, slips in the caslng, a hinged joint on the upper end of the slip casing, a tubular section hinged to said joint, a piston in said tube operable by the drilling mud pressure, a rod de- 9o pending from said piston, a wedge on the bottom of said rod, saidwedge being adapted to engage the joint'to swing the same to one side and extend the hook and slip casing at an angle to the tubing.

2. An odset overshot tool comprising a wall hook, a slip casing rising from the hook, slips in the casing, a hinged joint on the upper end of the slip casing, a tubular section hinged 'to said joint, a piston in said tube Von said slips, said operable by the drilling mud pressure, a rod depending from the piston, a guide throu h which the rod extends, a spring between t e piston and guide, a roller secured'to said hinged joint, a second roller secured to the tublng, a wedge on the bottom of said rod adapted to extend between said rollers whereby the joint is rotated to swing the hook and casing at an an le to the tubular section.

3. An offset overs ot tool comprisin a wall hook, a slip casing rising from the hoo slips in the casing, a hinged joint on the upper end of the slip casing, a tubular section hinged to said joint, a piston in said tube operable by the drilling mud pressure, a rod depending from said piston, a wedge on the bottom of said rod, said Wedge being adapted to lengage the joint to swing the saine to one side and extend the hook and slip casing at an angle to the tubing, said joint having a duct extendin therethrough, and said piston having blee holes therein through which the drilling mud is adapted to pass to operate said slips.

4. An oifset overshot tool comprising van upper-tubular. section, a slip section hingedly connected to the tubular section, slips in the slip section, a hydraulically actuated piston in the tubular section, means depending from said piston and engaging the upper end of the slip section, whereby said slip section is extended at an angle to the tubular section when the piston is depressed, a cup resting iston having bleed holes therein through w ich the hydraulic pressure passes to bear against the cup and compress the slips.

5. An oiset overshot tool comprising a Wall hook, a slip casing rising from the hook, slips in the casing, a hlnged joint on the upper end of the slip casing, a tubular section hinged to said joint, a piston in said tubular section operable by the drilling mud pressure, a rod depending from said piston, a wedge on the bottom of said rod, said wedge being adapted to engage the joint to swin the same to one side and extend the hook an slip casing atan angle to the tubing, a guide 1n the tu ular section through which the rod extends, and a spring between said guide and piston.

In testimony whereof, I aix my si nature.

GUSTAVE J COR IER. 

